Mines belly is entirely white, so seeing spots im not sure about. Mine is very easy going, gentle even. They do have sensitive stomachs as mine regurged 8 days ago after several successful feedings. So if you get it, i would feed every 7-10 days. They are very soft snakes, they feel different than any other snakes I've held.
As far as buying it from Petco.. I wouldn't but that's just me. I'm fortunate to have a reptile store right down the road from me and he breeds them, so there are plenty lol.
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